Pressure Resistant Of Bellows

Pressure resistance is an important parameter of bellows performance. When the bellows is at room temperature, the maximum static pressure that the bellows can withstand without plastic deformation on the waveform is the maximum pressure resistance of the bellows. Under normal circumstances, the bellows works under a certain pressure (internal pressure or external pressure). , so it must withstand this pressure without plastic deformation during the entire working process.

The pressure resistance of the bellows actually belongs to the strength category of the bellows. The key to the calculation is the stress analysis, that is, to analyze the stress on the bellows wall. As long as the stress at the maximum stress point on the bellows wall does not exceed the yield strength of the material, the pressure on the bellows will not reach its withstand pressure.

When other working conditions are the same, the same bellows has better stability under external pressure than under internal pressure, so the maximum pressure resistance under external pressure is higher than that under internal pressure.

When the two ends of the bellows are fixed, if a sufficient pressure is introduced into the inner cavity of the bellows, the crest of the bellows may be damaged by blasting. The pressure value inside the bellows when the bellows begins to burst is called the burst pressure. Burst pressure is a parameter that characterizes the maximum compressive strength of bellows. During the whole working process of the bellows, its working pressure is much lower than the burst pressure, otherwise the bellows will be ruptured and damaged.

When the corrugated length is less than or equal to the outer diameter, the calculated result is very close to the actual burst pressure; for the slender corrugated pipe, the actual burst pressure is much lower. The burst pressure is about 3 to 10 times the allowable working pressure.